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Lichen

Deprive is a name applied to a number of skin diseases characterized by a rash of nodules that do not consistently change into other precipitates (bubbles, pustules, etc.).

These diseases are: lichen ruber planus, lichen nitidus, pityriasis of the skin Devergey (pointed red lichen).

Lichen ruber planus ( lichen planus ) is a frequently observed skin disease of unknown etiology. The most likely theories of its origin are neurogenic (in favor of which are strong itching, sometimes observed rash along the nerves, and also that the disease often occurs after a severe trauma) and infectious - the assumption that the disease is caused by a neurotropic virus. Adults are mostly ill (30-50 years), children and young people are extremely rare.

lichen planus

Skin lesions are characterized by a rash of small flat nodules, initially pale pink, then purple, glistening in lateral illumination. In the center of the nodule there is an umbilical depression. The rash is accompanied by severe itching. In the future, the nodules merge and form small plaques of small-palestone outlines, on the surface of which they are revealed, especially after wetting with a grayish-colored mesh, a symptom of Wickkem. Sometimes nodules grow around the periphery and, resolving in the center, form ringlets.

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The rash is mainly localized on the flexor surface of the forearm , the front surface of the lower legs, in the lumbar region, on the genitals, but in some cases the lesion may spread to the skin of the entire body. Often there is a lesion of the oral mucosa, mainly on the cheeks, in the form of a white mesh, and also on the edge and on the surface of the tongue, on the red border of the lips in the form of white plaques resembling leukoplakia (see). In place of resolved plaques and nodules, dark brown pigmentation is formed . Beginning acutely, the disease takes a chronic course and can last for many months or even years.

In addition to the main form, the following types are observed: 1) cystic, when in the acute period, along with nodules, bubbles appear; 2) atrophic, in which atrophy occurs at the site of resolved eruptions, and 3) verrucous, characterized by the fact that warty growths appear on the surface of plaques (it is observed exclusively on the front surface of the tibia).

In the differential and diagnostic relation it is necessary to mean papular syphilide (see. Syphilis ).

Treatment . In the acute period, broad-spectrum antibiotics ( biomitsin , etc.), synthetic antimalarial drugs ( resocine , delagil), calcium gluconate injections, vitamins C, B1 are shown. With severe itching, Dimedrol, Suprastin, Pipolfen. Outwardly - antipruritic agents. In some cases, hypnosis treatment is recommended. In the case of verrucosa, local novocaine blockade, carbon dioxide massage with snow.

Lichen nitidus ( brilliant lichen ) is a rare skin disease of unknown etiology. More often sick children. It is characterized by a rash of small, no more than a pinhead, shiny knots of the color of normal skin, round or polygonal in shape, not merging with each other. Most often localized on the penis and on the flexor surfaces of the forearm, less often on other skin areas. Subjective feelings are absent. For a long, chronic. The treatment is unsuccessful. Recommend the appointment of vitamins A, C, B1 , ultraviolet irradiation.

Red pityriasis versicolor Deverzhi - see Pityriasis .

Lichen (lichen) - a term, previously widely used to define the different nature of dermatoses, manifested externally of the same type of nodular rash. Hebra (F. Hebra) narrowed this concept, suggesting to call “lichen”, or deprive, only those chronic skin diseases that are characterized by a rash of nodules that do not transform into any other morphological elements (vesicles, pustules, etc.). In this sense, the group of lichens includes: lichen ruber planus , lichen nitidus , lichen ruber acuminatus, lichen amyloidosus (see skin amyloidosis), lichen myxoedematosus (see skin myxedema), lichen circumscriptus, s. simplex chronicus Vidal (see Neurodermatitis), lichen pilaris (see Keratoses), lichen scrophulosorum (see Skin Tuberculosis).

The name “lichen” was kept for some dermatoses characterized by rash of scaly patches [lichen pink (pityriasis rosea), scaly lichen (see Psoriasis), pityriasis versicolor, simple lichen (pityriasis simplex)], and also a blistering (see Herpes).